How to Recover Deleted Contacts on iPhone with Ease As Apple's iPhone has become a sought-after handset world, one of most common things that can happen while using the smartphone is that you may lose your contact details by accidental. Jailbreak, iOS upgrade or restoring to factory settings may erase your data, but that doesn't mean it is gone forever. Each time you connect your iPhone to your PC, iTunes automatically syncs the data in iPhone's database. As long as you've got a backup of your contacts, you can recovery it on your iPhone easily. Recover lost iPhone contacts via iTunes backup files You're in luck if you have backed up before you deleted the contacts, just restore from iTunes backup files via iTunes. Step 1: Configure iTunes so that it doesn't automatically sync with your iPhone when it is connected to your computer; Step 2: Connect your iPhone to your PC; Step 3: Open iTunes, right-click on your device and press "Restore from backup...". Recovery tool method to retrieve deleted iPhone contacts without backup Below assorted are step by step guide of how to recover deleted contacts on iPhone 3GS/4/4S/5, before that, you need install and run Data Recovery for iPhone on your Mac.
Step 1: Connect iPhone to your Mac, then open iTunes to back up your files;
Step 2: Run the program and click "Recovery" to start the progress;
Tip: You can preview the files recovered and your device information during the scan.
Step 3: Preview the deleted contacts before you decide to recover;
Step 4: Click "Save" to save the contact files to your computer.
Source: http://datarecoveryforiphone.com/resource/105-How-to-Recover-Deleted-Contacts-on-iP hone-with-Ease.html